Window-scaffold.



A. HARms. WINDOW SCAFFOLD.

APPE ICATION FILED IAN.B. I91]- lPartemetl Feb. 26, 1918.

ALFRED A. HARRIS, OF SAN FRANCISCO, CALIFORNIA.

WINDOW-'SOAFFOLTD.

Application filed January 8, 1917.

To all whom it may concern:

Be it known that I, ALFRED A. HARRIS, a citizen of the United States, residing at San Francisco, in the county of San Francisco, State of California, have invented a new and useful VVindow-Scafiold, of which the following is a specification in such full and clear terms as will enable those skilled in the art to construct and use the same.

This invention relates to a window scaffold, an obj ect of which is to produce a scaffold which will enable the outside of windows to be cleaned without danger to the operator.

Another object of the invention is to provide a window scaffold support which will also be capable of being taken down and assembled to form a compact package for the several parts making up the scaffold.

Other objects of the invention will appear as the description proceeds.

An embodiment of the invention is shown in the drawings in which the same reference numeral is applied to the same portion throughout, but I am aware that there may be many modifications thereof Figure 1 is a side elevation of the complete apparatus asit appears when in use on a window sill.

Fig. 2 is an end view of the apparatus looking from the right Fig. 1.

Fig. 3 is an end view of the apparatus showing the cover in place with the end of the box down.

Fig. 4 is a view partly in section of one of the stirrups which holds the box in the position shown in Fig. 1.

Fig. 5 is a side elevation of the box as it appears when assembled and ready to be carried from place to place, and

Fig. 6 is a transverse sectional view 01 the boxshowing one of the clips for securing it to one of the side frames.

The scaffold comprises a pair of bars 1 and 2, each bar being bent downwardly at 3 and having a guard plate 4 at the other end thereof to prevent the house from being marked, which bar is bent to provide an upper and a lower member. The bars 1 and 2 have two angle plates 5 connected therewith, the object of which is to hold the bars level when used on walls of different thick ness, 2'. c. with a thick wall the plates would be placed as near the hooks 3 as possible while with a thin wall they would be moved almost vertically over t. Each angle plate Specification of Letters Patent.

Patented Feb. 218, 1918..

Serial No. 141,169.

5 is carried by a clip 6, which surrounds the bar 1,and its position thereon is adjusted and fixed by means of the wing nuts 7. In order to make the bars 1 and 2 of as light material possible one end thereof is connected with the upper portion thereof by means of a strap 8, which is riveted there to, and which prevents the lower member from spreading away from the upper member when a weight is placed upon the lower step. The upper step or seat consists of a box having a bottom 9, end 10, sides 11 and 12 and top 13, which parts are all readily connected together.

At one end of the box there is a door or gate let hinged to the box bottom at 15, 16. The upper edge of each of the sides 11 and 12 has a groove therein as indicated at 17, the object being to receive the two top pieces 18, 19, which top pieces are hinged together at one edge as indicated at 20, 21, and when folded one on the other, as indicated in Figs. 1 and 2 they form the bottom step of the scaffold, and they are connected thereto by means of four clips 22, 23, 2 1, and 25, which embrace the lower portion of each of the bars 1 and 2 to prevent them from spreading, and two clips 26, 27, also connected with the portion 18, prevent the bars 1 and 2 from being displaced from the clips 22 to 25 inclusive. The clips 22 to 27 inclusive,

when not in use, may be turned around so as to be out of the way to enable the two boards 18. 19 to be run into place in the grooves 17 to form the top closure of the satchel or box in which the arms 1 and 2 are to be placed. The upper portion of the grooves 17 is formed by means of two plates 28, 29, which are suitably secured to the box sides 11 and 12. Within the box are two pivoted 1.. shaped lugs which are shown at 30, 31, which can move outwardly far enough to allow the rod 32 to be passed therethrough in contact with the outside of the bottom 9. Steps 33 prevent the lugs 30, 31 from moving out more than the amount shown in Fig. 6. The rod 30 is provided with two wing nuts 34, 35, for connecting with the bars 1 and 2, and pivoted clips 37, one for each bar 1 and 2 embrace one end of the box sides 11 and 12 for holding the box rigidly in. the position shown in Fig. 1. The two clips 37 are pivoted on the sides 1 and 2, and may be turned down parallel therewith when it is desired to packthe scaffold. When the end 1 1 of the case is turned up to the position shown in Fig. 5, it is locked in that position with a. spring catch 42, which is secured to the side 18, and which passes over a projecting pin 11 on the edge of the end 1 1. When the entire scafl'old is dis-assembled and placed within the case, the case may be carried by means of the handle 43 on one end thereof.

In operation the scaffold is placed over the window sill with the angle irons 5 adjusted to the proper position with respect to the wall thickness to hold the lower step and case bottom 9 level. The downwardly bent'arm's 3 act as a safety stop to prevent the scaffold from falling should the angles 5 slip. To reach the upper part of the window sash, the case may be turned tothe position shown in Fig. 1, and the workman will 7 be able to either stand or sit upon said'case,

while to reach the lower portion of the sash, the case may be turned up to the position shown inldotted lines and the lower step used for the workn'ian to stand on.

hen the scaffold is to be dis-assembled the 7 latch 1-2 serving to hold the end 14in theclips holding the lower step formed of the proper position and since said end cannot move endWiS-e without at the same time turning, the sides 18, 19 serve to hold the entire package together,

l'Vhere desired the scafi'old may be used without the top, the rod 32 being simply inserted in the frames without the top deck,

in which event the rod acts as a guard as .well as holding the two frames together.

The operationof the scafiold is as follows :The angle plates 5 are set so the distance therefrom parallel to the upper part of the bar 1 to the plates 4 is equal to the wall thickness. The parts 18, 19 are then secured to the lower partof the bar 1 with the clips 26, 27. The rod 32 may then be inserted without the case or with it as desired. The scaffold is then ready to be placed on the window. The plates a are placed in contact with the outside of the wall and the plates 5 in contact with the inside of the window sill. If the clamps holding the plates 5 should slip, the down turned arms 3 act as a safety to prevent the scaffold from falling.

Having thus described my invention what I claim as new and desire to secure by Lelters Patent of the United States, is as follows:-

1. A window scaffold comprising a pair of rectangular frames having a. hook at one end, an adjustable stop adapted to hold the frames in a fixed position with respect to a window sill and house wall, a lower platform remoyably connected with the lower portion of said frames, the upper platform pivotally connected to the upper portion of the frames, means to hold said upper plat form rigidly in line with the upper portion of the frames. said upper platform being also adapted to contact with the lower platform when turned substantially 90 degrees with respect to its normal position to form a back for the lower platform.

2-. A window scaffold comprising a pair of rectangular frames adjustable stops carried by each frame and adapted to hold the frame in a fixed position with respect to a window sill and house wall, a lower plat form supported by the window frame. clips to secure said platform to the frames, and a case adapted to form an upper platform pivotally connected with the frames, said case also being adapted to contain said frames when they are dis-assembled therefrom, the lower platform forming a closure for said case.

In testimony whereof I have hereunto set my hand this 29th day of December, A. D. 1916.

ALFRED A. HARRIS.

Copies of this patent may be obtained ior f ve cents each, by addressing the Commissioner of latents,

Washington, D. G. 

